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I would like to do the inverse of this (exactly same example): Extract rows from file_1 based on matching the first two columns from a file_2

That is, extract all rows from file_1 except those with the first two columns matching the first two columns from file_2.

Answer:

awk 'NR==FNR {get[$1" "$2]++; next} !get[$1" "$2]' f2.txt f1.txt
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    You can use the logical negation of the previous condition: !($1" "$2 in a) – steeldriver Jan 22 '19 at 1:46
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This should work:

$ awk 'NR==FNR {get[$1" "$2]++; next} !get[$1" "$2]' f1.txt f2.txt

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